Dive into an intermediate-level ASP.NET Core tutorial focusing on refactoring cart functionality and optimizing database interactions in an online shop application. Explore techniques to balance functionality between database and services, while streamlining the cart implementation. Learn through hands-on examples, including SQL demonstrations, to enhance your web development skills. Follow along with the provided source code to apply concepts in real-time. Gain insights into best practices for structuring e-commerce applications and improving overall performance.